Help identify radiator trap

Shane_2

Wondering if any of you guys recognize this steam radiator trap so I could locate proper replacement for this system.

Will the B&J 122A work for me here?

EBEBRATT-Ed

I have never seen that trap before. Maybe @Steamhead will comment. You can replace it with any thermostatic radiator trap.

mattmia2

Make sure it actually is a trap and isn't some sort of vapor system return device.

Shane_2

System has 6 radiators with this device, and 2 radiators with two pipes and vents.

Starting to think the system started life as a vapor system, no additional traps in the system, but there are 3/4 & 1/2" returns that tie in below the boiler water level

Steamhead

It's a Haines Vento trap. This type of trap used a Bourdon tube rather than an expanding bellows or diaphragm. Here's what it looks like inside:

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://us.v-cdn.net/5021738/uploads/FileUpload/4b/cb7fd86385905929fda3cf57bb05bf.pdf&ved=2ahUKEwiMhJKJquSKAxVwLVkFHb_1B6QQFnoECB0QAQ&usg=AOvVaw1KBzkX49qdN-WXhpoqNsXV

AFAIK, these traps are not rebuildable, but the B&J #122A is a good choice for replacement.